Carburetor



March 5, 1929.

A. A. AYERS CARBURETOR Filed July 20, 192? INVENTOR LQLATTORNEYS.

Patented Mar. 5, 1929.

UNITED S ATES.

' ALBERT n. AYERS, or BAKERSFIELD, CALIFORNIA.

cannvnnron.

npplic atio'n flled m 20, 1927. Serial m. 207,133.

My invention. relates to carburetors ofthe V spray nozzle float feedtype especially adaptvide means for automatically proportionin the fuelwith respect to the air.

Another object of my invention is to provide-a carburetor which caneasily be assembled and disassembled.

My invention possesses other advantageous, features, some of which withthe foregoing will, be set forth at length in the following descriptionwhere I shall outline in full that form of the carburetor of myinvention, which I have selected for illustration in the drawingsaccompanying and forming part of the present specification. In saiddrawings I have shown one form of carburetor embodying my invention, butit is to be understood that I do not limit myself to such form sincethe. invention,

in aplur ality of forms.

In the drawings: p

Fig. 1 is a section thru the carburetor of my invention, the plane ofsection being vertical. 1

Fig. 2'is my invention can be constructed in a numberof different.

ways, Ipreferably buildv it as shown in the accompanying drawings. Thecarburetor body 6 is preferably of. castinetal and is formed with anintegral, cylindrical float chamber 7 The bottom of thefloat chamber istapped for a, reducer 8 into which is as set forth inithe claims, maybeembodied screwed an elbow 9. connecting with l the source of fuel, notshown. The reducer is provided with avalve seat 11 cooperating with aconical valve 12 on a stem 13 passing" upwardly thru the float chamberand guided by the cover 1 1. On the stem 13 and preferably securedthereto by fingerslfl is a float 17. The float is usually a hollowmetallic body apertured to receive the stem 13 aid is preferably affixed"to the friction fingers 16 so that thefloat isadjustable on the stem 13and can be variously positioned to alter the fuel level within the floatchamber 7. 'A removable cap 18 is screwed to the cover 14E and protectsthe projecting stem 13 from interference but allows it to be manuallymanipulated. T

. The weight of float li'is suflicient to keep the valve 12 from seatingand permits the fuel to flow thru the elbow 9 into the charm her 7. Whenthe fuel attains the selected height, the buoyancy of the float liftsthe valve 12 against the seat 11 and cuts off further influx until u thelevel drops sufficiently'to cause thetunseating of valve12.' The levelof gasoline within chamber 7 is thereby maintained given height.

friction approximately at ,a

Also formingpartof the carburetor body 6. is, an air inductiontube 19preferably integralwiththe body and of generally cylindrical shape tosurround an induction passage 21 communicating with an intake manifold22 of the usual kind. I The induction passage 21 is preferably verticalandat its lower or inlet end is provided with an air horn 23 which isflared to facilitate the influx of air. The air horn can readily bedetached from the body (i-by removing the clamp 24:. To control theentrance of. air to the induction passage, a butterfly valve .26

is mounted on a shaft 27 journaled in the horn, and is controlled bysuitable means to vary. the amou'ntof restriction of thepasage v I u IToincrease the velocity of the air entering in the induction passage andalso to form a portion of a fuel well, I preferably provide aVenturiblock 28 of annular form disposed within the induction passage. The

block is conveniently a metallic ring having its internal contoursubstantially that of a venturi, while externally it is provided with aperipheral flange 29 seated on a shoulder 31 formed in the body 6. Abovethe flange 29, the Venturi block is reduced in external diameter toenclose an annular fuel well 32 surrounding the induction passage 21.Communication between the fuel well 32 and float chamber 7 is by apassage 33 thru the carburetor body 6.

Preferably I provide a plurality of fuel nozzles for conducting fuelfrom the well 32 to be mixed with the air flowing in passage 21. Thenozzles are usually tubes 34 of relatively large internal diameter whichare closed at their upper ends by caps 36 having relatively minuteaperatures 37 therein. The tubes are all seated in a nozzle ring 38situated within the induction pas sage and forming a seal for the upperpart of'the fuel well 32. A gasket 39 affords a fuel tight junction. Thenozzles extend well down into the fuel well at their lower ends and attheir upper ends preferably terminate in different planes. In oneembodiment I have terminated more than half of the nozzles in a. planejust slightly above the normal fuel level in the float chamber 7 whilethe remainder of the nozzles are terminated in a plane considerablythereabove. The result of such an arrangement is that under normaloperation of the carburetor at moderate speeds only the lower nozzlesare active while as the speed is increased and the velocity of theinflowing air becomes greater, suflicient suction is exerted upon thehigher nozzles and gasoline is withdrawn from them in addition to thelower nozzles. in this manner the mixture is somewhat enriched at higherair speeds thus improving the operation of the engine to which thecarburetor is attached. lVhile I have shown the nozzles terminating intwo planes, 1 can also terminate the nozzles in more than two planes,depending upon the conditions to be met. g

The velocity of air passingthe lower nozzles is materially increased anda more intimate mixture of fuel and air is afforded by an'air deflector41 which usually 'COl11- prises a double cone of metal suspendedwithinthe air passage by attachment to'the nozzles, as by soldering, andpreferably situated with its greater diameter in the plane of the lowernozzles. The cone is instrumental in gradually increasing the airvelocity until it is a mum flowing by the lower nozzles and thenuniformly causing the velocity to assume its normal value adj acentthehigher nozzles.

To retain the nozzle ring in place, I install a sleeve 42 within theinduction tube 19.

The sleeve is generally cylinderical and fits within the tube withslight clearance. The

lower end of the sleeve bears upon a gasket 43 interposed between thesleeve and nozzle ring 38 so that a fuel tight joint is made. The sleeve42 is urged toward the ring 38 by aflange 44 preferably shaped toconform to the contour of the manifold flange 46 and secured by screws47 to a collar 48 surrounding the carburetor body 6. The collar isprovided with a groove 49 in which a split ring51is situated which inturn engages a suitable groove 52 cut in the induction tube 19. A gasket53 is interposed between the flange 44 and the collar 48 and when thescrews 47 are tightened the collar abuts the split ring 52 and forcesthe sleeve 42 clownwardly thereby firmly retaining the nozzle ring 38and the Venturi block 28 in position. Suitable bolts 54 secure thecarburetor on themanifold 22.

For regulating the amount of mixture passed by the carburetor to themanifold, a butterfly valve 56 is disposed in the upper portion of theinductionpassage 21 and is secured to a shaft 57 journaled in the sleeve42. The shaft is rotatedby manual means, not shown, and is received by aslot 58 cut in the induction tube 19. Rotation of shaft 57 variouslyrestricts the induction passage 21 and regulates the quantity ofcombustible mixture passing from the carburetor into the manifold 22.

On the side of sleeve 42 adjacent the edge of the butterfly valve 56when it is nearly closed, is a boss 59 received in a slot 61 in theinduction tube 19 and provided with a passage 62 to form an idlingnozzle. The passage 62 is supplied with fuel thru a tube 63 having itslower end in communication with passage 33 and its upper end seated in areducer 64 screwed into theboss 59. Com munication with the upper end oftube 63 is afforded by a plug 66 in alinement with the upperend of thetube while aplug 67 affords access to the lower end thereof. 1

My carburetor not only affords a properly proportioned combustiblemixture for all speeds of inflowing air but it is also easily assembledand disassembled. The carburetor can easily be taken apart after it isremoved from the manifold 22 by removing the flange 44 and lowering thecollar 48. After the sleeve 42 is extracted, the nozzle ring can bewithdrawn with its assembled nozzles and air deflector, and the Venturiblock can be withdrawn. The entire carburetor is thus simply taken apartand can be as easily assembled.

I claim:

1. A carburetor comprising a body having an induction passage therein, aplurality of nozzles arranged in a circle within-said passage, and 'aconical air deflector supported by said nozzles.

2. A carbuetor comprising a body having a vertical induction passagetherein, aring disposed in said passage, a plurality of verringandextendin from said well into said tical nozzles secured to said ring,and an air passage, and a conical air deflector supported I deflectorsupported by said nozzles. in. said passage by said nozzles. 10

3. A carburetor comprising a body having In testimony whereof, I havehereunto 5 an induction passage therein, a fuel Well set my hand.

surrounding said passage, a ring sealing said Well, a plurality ofnozzles secured to said ALBERT A. AYERS

